<p>HIFI is one of the Esprit III information-processing system and software projects. The goal of HIFI is to create a set of tools that can be used to cheaply and quickly build a hypertext-like interface on top of an external database-information system. The interface provides interactive navigational access to information both within a database of one kind and across databases of different kinds, including multimedia. HIFI's model for the navigational interface, mapping strategy to map the interface model to database structures, and architecture for the execution tools are discussed.</p>